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Finding the Fourth Proportional to 66,490,996.80, 99,736,495.20 and 40,981,828.80

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Solution

The fourth proportional to 66,490,996.80, 99,736,495.20 and 40,981,828.80 is: 61,472,743.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,490,996.80 : 99,736,495.20 = 40,981,828.80 : x
  2. Step 2: Convert to fraction form
    66,490,996.80/99,736,495.20 = 40,981,828.80/x
  3. Step 3: Cross multiply
    66,490,996.80x = 99,736,495.20 × 40,981,828.80
  4. Step 4: Simplify right side
    66,490,996.80x = 4,087,383,971,398,421.50
  5. Step 5: Solve for x
    x = 4,087,383,971,398,421.50/66,490,996.80
  6. Step 6: Final answer
    x = 61,472,743.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.